<mat-toolbar color="primary">
  <button mat-icon-button (click)="openSidebar()">
    <mat-icon>menu</mat-icon>
  </button>
  <span>企业协作平台</span>
  <span class="fill-remaining-space"></span>
  <mat-slide-toggle (change)="onChange($event.checked)">黑夜模式</mat-slide-toggle>
</mat-toolbar>
